Part II - State of New Jersey

APPENDIX C 203Very faint plieations on the anterior hinge extremity which do notconnect with the larger plications of the opposite side. The centralportion of the shell is relatively smooth, without conspicuous rihs orplications. There are faint indications of concentric groxth lines andvery faint radial rihs near the beak.Ostrea raritanensis differs from the common Cretaceous 0. falcafabiorton by its much less conspicuous plications which do not extendacross the shell. Also, 0. raritanensis is smaller in size and is morepoint,ed at the posterior end than in the case of 0. falcata.Dimensions: Length 9 mm., midth 3.1 mm., thickness 1.6 mm. (holotype); length 12.2 mm., width 5.1 mm., thickness 3.2 mm. (unfigureclparatype) ; length 15.6 mm., width 7.1 mm., thickness 2.2 mm. (unfiguredparatype).Locality: Boring 16 (1648 feet) RARITAN formation.Holotype: AI\'SP 30441.Exogyra woolmani RiellardsPlate 93, Figure 7Fairly common in Core 16 at 1648 feet. See Val. 1, p. 121.Gryphaea aucella RoemerPlate 94, Figure 4Grypkaea azceella Roemer, 1849, "Texas" p. 395 (Bonn, Germany).Several specimens from Core 16 at 1648 feet appear to he identicalwith this species originally described from the Cretaceous of Texas.G. aucella is closely related to G. convcza (Say) and may actually bea variety.Crenella growi Richards n. sp.Plate 93, Figure 15, 1.6Shell small, inflated, slightly longer than high, subeqnilateral, equivalve.All margins arched. Hinge typical of the genus. Beaks moderatelyprominent, incurved and located at the center. Onter surfaceornamented with smooth closely spaced radial rihs numbering about10 to the millimeter at the ventral margin. Interspaces cut by fine eoncentricthreads.Crenella grolci differs from C. .subcirci~laris Stephenson from theWoodbine of Texas in that it is much more rounded and shows bothconcentric and radial sculpture.Dinlenswns: Length 6.2 mm. ; width 6.0 nnn.; thickness 5.0 mm.Localit?/: Boring 16 (1648 feet) RARITAN formation.Holotype: ANSP 30440.NEW JERSEY GEOLOGICAL SURVEY